Reduce PDF Size for Email
Attachment bounced? Gmail, Outlook and corporate servers each play by different rules — here's what they are and how to fit inside them.
The limits that actually apply
| Provider | Send limit | What arrives on the other side |
|---|---|---|
| Gmail | 25 MB | Over 25 MB total, Gmail offers a Drive link instead of the file |
| Outlook.com | 20–34 MB (varies) | Often silently converts to a OneDrive link |
| Corporate Exchange | 10–20 MB | Bounces — this is the one that hurts |
| Older receiving servers | 5–10 MB | Bounce with a cryptic size error |
The trap: your own provider accepting a 24 MB file doesn't mean the recipient's server will. When in doubt, target under 10 MB total, attachments combined.
Trim in the right order
- Drop pages you don't need. Appendix, blank pages, duplicate signatures — split out only what the recipient needs. Zero quality cost.
- Compress what remains. Use the target-size compressor with your budget: 5 MB, 2 MB, even 200 KB for picky portals. The tool finds the highest quality that fits.
- Re-check the total. Multiple attachments share one limit — compress each, then check the sum before hitting send.
When compression isn't the answer
- Photos as separate files? Keep them out of the PDF — send images directly, or combine them into one PDF only if the recipient expects a single document.
- Need text to stay selectable? Heavy compression rasterises pages. Re-export the source with image downsampling instead.
- Document is legitimately huge (a book)? Use a link, not an attachment — but compress a preview version for the body of the mail.
One etiquette rule worth keeping
A compressed scan that opens instantly is kinder to mobile recipients than a 30 MB original that pins their inbox on a train. Getting under ~5 MB is rarely about the hard limit — it's about the person on the other end.